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(No Model.)

.J. P. DOELFEL & P. SPIESS.

ROLLER REDUCING MHIL.

WIN/58858.: way

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UNITED STATES PATENT Fries.

JOHN P. DOELFEL AND FREDERICK SPIESS, OF NEW YORK, N. Y.

ROLLER-REDUCHNG MILL.

SPECIFICATION forming part of Letters Patent No. 373,728, dated November 22, 1887. Application filed Februnryii, 1887. Serial No. 226,455. (No model.)

To CLZZ whom it Duty concern:

Be it known that we, JOHN P. DOELFEL and FREDERICK Srrnss, citizens of the United States, residing at New York, in the county and State of New York, have invented new and useful Improvements in Roller-Reducing Mill of which the following is a specification.

This invention has for its object to provide novel means for reducing grain and other material; and it consists in the features and combination of devices hereinafter described and claimed, reference being made to the accompanying drawings, in which-- Figure l is a side sectional elevation of a roller-mill embodying our invention. Fig. 2 is a section on the line a: at, Fig. 1. Fig. 3 is a front elevation on a smaller scale than Fig. 1. Fig. 4 is a sectional detail elevation showing the hopper-valve opened. Fig. 5 is asectional detail elevation. showing the hoppervalve closed. Fig. 6 is a detail elevation of the devices for opening and closing the hopper-valve.

In the drawings, the letter A designates a base or support.

B is the casing or frame of the mill.

The material to be ground or operated on by the mill is fed through the hopper O. The outlet of the hopper C may be closed and opened by a valve, D, consist-ing of a portion of a cylinder adapted to turn about the axle E. By turning the valve D to the position shown in Fig. 4. the outlet of the hopper O is opened.

In Fig. 5 the valve D is shown as closing the outlet of the hopper 0. By turning the valve D about the axle E in the proper direction the outlet of the hopper C- can be only partially closed, so as to allow material to flow at greater or less speed. The axle E is connected to a crank-plate, F, having a handle, G, by which means the valve D can be operated.

To the case B is connected'a rod or arm, H, extending through a segmental slot, J, in the plate F. By clamping a thumb-nut, I, on the arm H against the plate F said plate, with the valve D, can be fixed in any desired position to leave the outlet from the hopper C more or less open. From the hopper G the grain or other material passes between crush ing or grinding rollersK L, where such mate rial is ground or comminuted. From the rollers K L the material passes ofi through the lower part of the frame or casing B to an exithopperY.

To the casing 13 are hinged doors X, to gain access to the interior of the casing.

The rollers K L are made movable toward or from one another, the roller L being stationary and the roller K movable; but, if desired, both rollers may be made movable. The bearings O P of the rollers K L are supported in boxes or supports M N, so that the roller K can be moved by sliding or moving its boxes M along ways Q, at the sides of the casing, by set-screws R, operated by wheels S, adapted to move the box M with the roller K toward or from the roller L.

To prevent accidental turning of the setscrews R jam-nnts or screws U are applied to the set-screws It. By firmly clamping the jam-nuts U against any fixed portion of the machine the setserews S arefixed in position.

The handles T are adapted to operate the jam-nuts U. and the handles or wheels '1, being of greater leverage or diameter than the wheels S, the janrnuts U are clamped so tightly that the wheels S cannot be operated until the janrnuts U are loosened. The wheels S, with the set-screws R, can thus be secured against improper movement. The set-screws It are provided with convex headsV, bearing against the boxes M. The convex heads V operate against the boxes M with but slight friction, so that the set-screws E can be easily operated. By providing the boxes M with convex legs W said boxes M will travel along the ways Q with but slight friction. Suitable means, such as apulley, Z, Fig. 3, can be used to actuate the rollers K L. The safety doors or valves X can be held in their closed position by springs or weights applied in any suitable well-known manner.

Having thus described our invention, what we claim is 1. The combination, with the casing and the crushing-rolls, of the hopper G, the valve D, having an axle, E, the plate F on the axle having the segmental slot J, the arm H, secured to the casing and' extending through the slot In testimony whereof we have hereunto set of said plate, and the nut I on the arm in front ourhands and seals in thepresence of two subof the plate, substantially as described. scribing witnesses.

2. The combination, with the casing having 5 ways Q and the crushing-rollers. of the slid- I J. P. DOELFEL.

[L. s.] FREDERICK SPIESS.v [L. s.]

ing boxes M. having the pendent legs W arranged in said ways, the screws R, having the Wheels S and eonvex inner heads,V, engaging \Vitnesses:

the boxes. and the jam-nuts U 011 the screws E. F. KASTENHUBER, 1 1o havingthewheelsT,substantiallyas described. A. FABER DU FAUR. 3 

